[BOLT] Cover all call sites in writeBATYAML
Call site information setting was conditioned on branch information
presence for a given block. However, it's possible to have sampled
profile lacking one or the other for a given basic block.
Iterate over branch profiles and call profiles independently to cover
all recorded profile data.
Depends on https://github.com/llvm/llvm-project/pull/87569
Test Plan: Updated bolt/test/X86/yaml-secondary-entry-discriminator.s
Reviewers: ayermolo, dcci, maksfb, rafaelauler
Reviewed By: maksfb
Pull Request: https://github.com/llvm/llvm-project/pull/87743
